shell - Sh command with -c option in unix -

i trying run below set of commands using sh -c

sh -c " dup_flag=`wc -l test.dat | awk '{print $1}'`; user='test@domain.com'; text='hi'; subject='notification'; if [ $dup_flag -eq 0 ];   echo $dup_flag | mailx -r $user -s $subject $user; fi " 

it not giving desired result

when run same in script

dup_flag=`wc -l test.dat | awk '{print $1}'` user='user@domain.com' text='hi' subject='notification' if [ $dup_flag -eq 8 ]   echo $dup_flag | mailx -r $user -s $subject $user fi 

it giving desired result

can 1 me doing wrong here .i haven run them sh -c

thanks

the first version fails because double-quoted argument processed shell invokes sh -c "…your script…".

that means wc , awk run before sh -c invoked. also, various variable references $dup_flag etc evaluated invoking shell, not invoked shell.

you'd need use backslashes escape back-ticks , dollar signs. if changed $(…) notation, you'd still have escape $.

or use single quotes around sh -c '…your script…' , use double quotes appropiate inside script.

^{i thought i'd added 'escapes' , 'single quotes' sections before. submission process glitched (paused); internet connection @ fault, seem have closed tab without noticing not successful.}

escapes

sh -c " dup_flag=\`wc -l test.dat | awk '{print \$1}'\`; user='test@domain.com'; subject='notification' if [ \$dup_flag -eq 0 ]   echo \$dup_flag | mailx -r \$user -s \$subject \$user fi " 

single quotes

sh -c ' dup_flag=`wc -l test.dat | awk "{print $1}"` user="test@domain.com" subject="notification" if [ "$dup_flag" -eq 0 ]   echo "$dup_flag" | mailx -r "$user" -s "$subject" "$user" fi ' 

note single-quoted version make easier have multi-word subject lines email, etc.

in both versions, deleted text unused. semicolons aren't necessary when command spread on multiple lines (so removed them). they'd necessary if flattened onto single line.

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actually, need run mentioned commands in informatica command task runs commands sh -c " script ".

ouch. adds number of levels of possible confusion. informatica code creates shell command this:

char *args[] = { "sh", "-c", your_string, 0 }; execvp(args[0], args); 

in case, diagnosis of problem off mark; nothing except final shell interprets contents of string.

otoh, use:

char buffer[4096]; snprintf(buffer, sizeof(buffer), "sh -c \"%s\"", your_string); system(buffer); 

in case, system() function runs shell in turn analyzes , runs shell runs script. analysis comes effect.

there other ways achieve job; might have subtly different effects.